## How many different four-digit numbers can be made using the digits 1, 2, 3, 4, 5, 6 if no digit can be used more than once?

Question

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## Answers ( No )

To solve this problem you must use Permutation:

You want to made 4 digit numbers with the digits 1, 2, 3, 4, 5, 6 and no digit can be used more than once. So, we have:

(A,B,C,D)

A can variate in six (6) differents forms.

B can variate in (6-1)=5 differents forms.

C can variate 4 digits.

D can variate 3 digits.

Keeping this on mind, we have:

=6!/2!

=6*5*4*3

=360

The answer is: 360